Hoist



Nov. 10, 1925. r 1,561,072

. c. c. HANSEN HOIS'I Filed May 16, 1925 5 sheets-sheet 1 INVENTOR H l5 ATTORN C. C. HANSEN Nov. 10, 1925. 1,5 1,072

HOIST Filed May 16, 1925 3 Sheets-Sheet 2 Nov. 10 1925.

v c. c. HANSEN aoxsw Filed Ma 16', 1925 s Sheets-Sheet 5 BY V EN TOR.

Patented Nov. 10, 1925.

UNHTED STATEF FATE CHARLES C. HANsEN, 0F EASTON, PENNSYLVANIA, ASSIGNOR T0 rNeEnsoLL-EANn COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

HOIST.

Application filed May 16, 1925. Serial No. 30,756.

To all whom it may concern:

Be it known that 1, CHARLES C. HANSEN, a citizen of the United States, and a resident of Easton, county of Northampton, State of Pennsylvania, have invented a certain Hoist, of which the following is a specification, accompanied by drawings.

This invention relates to hoists and more particularly to hoists of the double drum type in which there is provided a main driv ing element which is adapted to actuate one or the other of two drums depending upon the direction of the rotation.

One object of the invention is to construct a hoist of this character of relatively few parts and having a positive drive. Another object is to arrange the drum driving elements so as to simplify and strengthen the hoist structure. Other objects of the invention are to brace the supporting standards by means of a center stationary or revolving shaft, and to drive the drums by a gear carrying a swinging pawl adapted to engage alternatively one drum or the other depending upon the direction of rotation of the motor. Still another object of the invention is to provide adequate support for the pawl to eliminate twisting and breaking strains in the pawl itself.

The invention will be more clearly understood by reference to the following description and the accompanying drawings in which,

Figure 1 is a side elevation of a hoist constructed in accordance with the practice of the invention, parts being broken away to show more clearly the internal construction;

Figure 2 is a perspective view showing the pawl removed from the main driver and pertions of the ratchet rings with which the pawl cooperates to rotate the drums;

Figure 3 is a front elevation partly in longitudinal section of a modification of the invention in which the drums are adapted to rotate with respect to the supporting shaft; and

Figure 4 is a side elevation of the hoist, the parts being broken away to show the internal construction; and

Figure 5 is a perspective of the driving gear and pawl showing more particularly the pawl mounting.

Referring to the drawings the hoist comprises a base A having standards B on either end adapted to support a shaft C provided with suitable journals D rotating in boxes of bearing metal and formed to resist end thrust of the shaft. Upon the shaft C are mounted two drums E and F each of which is provided with a bearing sleeve G rotatable on the shaft Cf The drum E is provided with a ratchet ring H having teeth preferably extending lnwardly but lying in radial directions. The ring I-I may, if desired, be formed integrally with the drum and be disposed internally on the inner flange J at the side of the drum E. Similarly the drum F is provided with a flange K within which is disposed a ratchet ring L. The teeth of the ratchet rings H and L extend in opposite directions since the drums E and F are to be rotated oppositely.

The drums E and F are adapted to be driven by a main driving element which may be a gear 0 keyed to the shaft C. A boss P on the driver 0 is provided with a bore Q, within which a pawl R is rotatably mounted. The pawl R is formed in two parts S and T entirely alike, each having a cylindrical bearing portion U with a dog tooth V extending at an angle therefrom. The ends of the bearing portions U are shaped to engage each other and prevent rotation therebetween and to this end shoulders W are provided at the ends of the bearing portions U. The two parts S and T are held together by a bolt X passing through the center of the pawl. I

The dog teeth V are adapted to engage one or the other of the ratchet rings H and L depending upon the direction of rotation of the driver 0. These dog teeth lie very close to the teeth of the ratchet rings so that one or the other of the teeth V is in engagement with one of the ratchet rings. Thus, when the driver 0 rotates in one direction the teeth on the ratchet ring L will kick the adjacent dog tooth V inwardly and cause the opposite tooth V to move outwardly to engage the teeth on the ratchet ring H. Upon rotation of the driver 0 in the opposite direction, the teeth on the ratchet rings H rock the pawl so that the other dog tooth V engages the tooth on the ratchet ring L.

For rotating the driver 0 any suitable means may be employed as for instance a worm Y journalled in a suitable gear case Z which is adapted to fit closely against the flanges J and K of the drums E and F to prevent dust and dirtfrom entering.

From the manner of driving the drums E and F it will be seen that one of thedrums is loose while the other is being driven. Therefore, ifdesired a brake may. be provided to prevent overrunning, ofone drum, as for instance F, by meansof a friction plunger 6 mounted-in aplug. c in the stand ard'B- and pressed intoengagement w'ith the outer flanged of the drum-F by means of a coil springeheldin place within the plug 0 by a-cap'f. Ifdesired-asimilar drag may be providedon the flange 9 of the drum E. I

In the embodiment shown in -Figure 2). the drums h and-j are rotatably mounted on the shaft 76 and a drive gear such as the worm wheel oj is provided with anti-friction bearings p held in place on the shaft 70 by the'nuts g. The shaft 70 is stationary and forms with the base a and bearing standards B a rigid brace for the hoist; The shaft is is provided-with shoulders ragainst which suitablewasherss are adapted to bear.

" The washers s provideendbearings for the drums it and j. Renewable bushings t flanged at their ends to bear against the bearings D are provided with bearings for the-drums h and j on the shaft '70.

The pawl R is preferably mounted in: a bushing w set into the bore Q intheboss P. Means are provided for supporting; the pawl R along; the entire length of the bearing port-ions U and especially atthe heel or portion behind the teethqV. To thisend the bushingu is arranged" to-- extend outwardly to the edgesofthe two parts S and T at the rearward sideof'the pawl, and is cutaway as shown at o to accommodate the teeth V and to permit slightrotation of the pawl. The remaini-ngportion w of the bushing a receives the thrust of thepawl thereby preventing bending strains in the bolt X. v

The main drivingelement or gear 0 may be driven in any; suitable manner. A preferred arrangement is shown-in Figure 4 in which the worm Y is mounted on the drive shaft of amotor (not shown) within a casing 00 suitably supported on the gear case Z and controlled by means of alever g associated with the throttle valveof the motor. 7 r

Preferably the motor within the casing 00 is'arranged with its axis transverse to the shaft C and in order to balance the drums E and F and the motor within the casing 00, the standards B are arranged to support the shaft C off'center on the base The base 2 is adapted to be clamped to a plate 2 or to a cylindrical column, a circular jaw 3 being provided for this purpose.

In'operation when the motor within the casing 00 is rotated in one direction causing the worm wheel O-to-rotate in a clockwise direction (Figure 4), the teeth on the ratchet ring H trip the corresponding tooth V rocking. the pawl R and causing the opposite tooth V to engage the ratchet ring L. Up

on reversal of direction of rotation. of the motor within. the casing 00 the worm wheel O rotates in the opposite direction causing the teeth on the ratchet ring: L to rock the pawl R to engagethe teeth on the ratchet ring HL The thrustof. the teeth V is taken it mainly for pulling a loadin one direction and returning: the receptacle, such as the scraper or mine slusher, empty inthe opposite direction, therefore, the load comes mainly on one of the drums. The wear is therefore unequal on the dogs and one of them may need replacement while the other is in good condition. By this method of constructing the pawl R, the worn half of the pawl may be replaced without the necessityv of replacing the entire pawl and the construction is substantially as solid and rigid as though the pawl were made in a single, piece.

I claim:

1. A hoist comprising, a pair of drums each provided with. a. ratchet ring having teeth extending. in opposite directions, a driver between the drums, a pawl mounted on said driver having teet h for selectively engaging with the ratchet rings, said pawl comprising: a central bearing portion and oppositely extending teeth adjacent the ratchet rings, and means to receive thethrust at the heel of the-pawl teeth.

2. A hoist comprisingv a pair: of drums each. provided. with a ratchet ring, having teeth extending opposite" directions, a driver between the drums,a pawl mounted on said driver having teeth for selectively engaging with the ratchet rings, said pawl comprisingvascentral bearing portion an'doppositelyext end-ing. teeth adjacent the ratchet rings, and, means to receive the thrust at the heel of the pawlteeth' including a. bushing forming a bearing extending to the outer edges of the pawland mounted in the driver.-

3. hoist comprising a pair of drums each provided with a ratchet. ring having teeth 7 extending in opposite directions, a driver, and a pawl mounted on said driver for engaging selectively with the ratchet rings and formed in two complementary parts, each having a dog tooth and a cylindrical bearing portion.

4:. A hoist comprising a pair of drums each provided with a ratchet ring having teeth extending in opposite directions, a driver, and a pawl mounted on said driver for engaging selectively with the ratchet rings and formed in two similar complementary parts, each having a dog tooth and a cylindrical bearing portion.

5. A hoist comprising a pair of drums each provided with a ratchet ring having teeth extending in opposite directions, a driver, and a pawl mounted on said driver for engaging selectively with the ratchet rings and formed in two similar complementary parts and ends to engage each other adapted to be bolted together.

6. A hoist comprising a pair of drums each provided with a ratchet ring having teeth extending in opposite directions, a main driver between the rings and a pawl on said main driver adapted to engage the rings selectively, said pawl being formed in two complementary parts each having a cylindrical bearing portion and a dog tooth extending at an angle therefrom, said parts having ends adapted to engage each other and arranged to be bolted together.

7. A hoist comprising a pair of drums each provided with a ratchet ring having teeth extending in opposite directions, a main driver between the rings and a pawl on said main driver adapted to engage the rings selectively, said pawl being formed in two similar interchangeable complementary parts each having a cylindrical bearing portion and a dog tooth extending at an angle therefrom, said parts having ends adapted to engage each other and arranged to be bolted together.

8. A hoist comprising a pair of drums each provided with a ratchet ring having teeth extending in opposite directions, a main driving gear between the ratchet rings, and a pawl carried by the driving gear and adapted to rock into engagement selectively wit-h one or the other of the rings depending upon the direction of rotation of the gear, said pawl being formed in two similar complementary parts adapted to engage each other at their ends each provided with a cylindrical bearing portion and dog tooth extending at an angle therefrom to engage the teeth of said rings and a bolt extending through the pawl and arranged to secure the two parts to each other.

9. A hoist comprising a central shaft, a pair of drums rotatable on the shaft, each drum being provided with a ring having radial teeth extending in opposite directions, a main driving gear on the shaft between the drums and a pawl carried by the main driving gear adapted to engage said rings selectively, said pawl including two symmetrical parts with oppositely extending dog teeth, each part having a bearing portion with cooperating notch ends and at an angle with said dog teeth anda bolt extending through the pawl to secure the two parts together.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN. 

